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mars1129 [50]
3 years ago
6

Why we need to do study island answer and u get 20 pints

Health
2 answers:
Fittoniya [83]3 years ago
7 0
Because it helps us with work and explains in further depths how to solve things
RideAnS [48]3 years ago
6 0
Because it will help us later in life
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. How do the UV rays cause damage? What exactly causes the skin to burn; can you please be more specific about this mechanism? 
grigory [225]

1. How do the UV rays cause damage?

UV rays cause a dimerization of the pyrimidines at the level of the genome (DNA).

The aromatic rings of the bases constituting the DNA molecule absorb the energy of photons associated with a wavelength of between 230 and 290 nm, ie in the UVC domain and, to a lesser extent, that of UVB. The energy absorbed at two adjacent pyrimidines (cytosine (C) or thymine (T)) provides the energy necessary for the formation of a covalent bond between these two bases, to the detriment of the hydrogen bonds established between two complementary bases and ensuring the cohesion of the double helix of DNA.

What exactly causes the skin to burn ?

The burns are due to the too intense absorption of the sun rays.

The skin is of course the first target of UV radiation. The epidermis attenuates the transmission of radiation of wavelength <300 nm, but allows the less energetic radiation to pass. UVB is therefore absorbed mainly in the epidermis and superficial dermis while UVA penetrates much deeper into the skin. They are responsible for sunburn, but also cause a warming of the skin and tanning.

Mechanism of photosensitive medications

- Photosensitization consists of a cutaneous reaction occurring during exposure to light.

- The mechanisms of photosensitization reactions differ in:

-> Phototoxic reaction, non-immunological, occurring in principle in all individuals, under two conditions:

* presence in the skin, in sufficient quantity, of a substance endowed with a phototoxic potential;

* light exposure of the skin by an effective wavelength at sufficient dose.

-> Photoallergic, immunological reaction, which is a cell-mediated delayed Type IV hypersensitivity reaction. It occurs only in predisposed subjects and does not take into account either the concentration of the molecule or the radiation dose.

-> Sometimes the origin of photosensitization is idiopathic; the photosensitizing agent is not known; this is the case of lucites.

Examples of photosensitive medications:

Here are the main families of photosensitizing drugs, sorted by order of frequency of photosensitization reactions.

* Antibiotics of the quinolone class

* Medicines containing amiodarone

* Diuretics containing sulfonamides

* Antidepressants and neuroleptics: ...

* Cholesterol treatments

* Anti-inflammatories containing ketoprofen, especially in the form of cream.

5 0
3 years ago
Which factors are the most likely to influence teens to become sexually active and why?
Lerok [7]

Answer:socialization, peer groups, family backgrounds, cultural influences,

Explanation:

6 0
3 years ago
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What are five major changes in a person’s life that could result in transitional stress
blsea [12.9K]

Death of a loved one

Divorce

Job loss

Moving

Major Illness or injury

8 0
3 years ago
What good component does cooking break down to make it more digestible
antiseptic1488 [7]
Your body is essentially expending less energy digesting cooked food than raw food, because the process of adding heat to your food has done some of the work for you. Think about eating something like celery. When you eat raw celery, it is very fibrous and hard break down without a lot of chewing. Now, when you eat cooked celery in something like soup, the same celery stalk require less work to be digested. This is because the soup-making process has broken down a lot of that fibrous material that required you to chew so much when the celery was raw. Other foods are known to have a lot of natural digestive enzymes within them. By cooking these foods, you are denaturing these enzymes and losing the inherent digestive properties of the food itself.

5 0
3 years ago
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What are the rules or standards to observe while working with solutions in a laboratory?
OLEGan [10]
<span>-Be alert to unsafe situations and report them immediately.
-Identify the types and locations of all chemicals or hazards.
-Reading and interpreting chemical labels and hazard signs.
-Use personal protective equipment (P.P.E)
-Locating and and using the M.S.D.S. manual containing all the safety data sheets.</span>
4 0
3 years ago
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